The Rab Andes 800 is a little warmer than some other bags, with a temperature rating of -22 deg C, but it’s still very light at just 1544g. This performance is achieved by using the most efficient down, so you get 800+ fill power down, made up of 90 per cent down and just 10 per cent feather. This down is then treated to make it water-resistant, so it absorbs less water, retains more heat when damp and dries faster. Pertex Endurance nylon is used on the outside of the bag to also enhance water resistance while maintaining breathability. Add in a full-length zip with a very wide insulated baffle plus a huge shoulder baffle, and you have a bag that will keep you comfortable in the coldest conditions. You get a good compression stuffsack too, so not only is the Rab Andes 800 light for its performance but it’s also compact, meaning you can cram it in a rucksack more easily.